Error in ITunes gift card code
iPhone 6s Plus, iOS 13
You have a gift card that has already been used. You will need to take that up with the vender/seller of the card.
ASC - Late 2012 Mac mini, macOS 10.15.2; Watch, series 5 GPS/cellular, watchOS 6.1.1; iPad Air 2, ipadOS 13.3; iPhone 8+, iOS 13.3; TV 4th Gen, tvOS 12.4.1; HomePods, audioOS 13.3 and Airport Express w/ Airplay 2